package top.hzy520.personalblog.util;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Utils {
    /**
     *
     * @param str 要加密的字符串
     * @return   加密后的字符串
     */
    public static  String code(String str){
        try {
            MessageDigest md=MessageDigest.getInstance("MD5");
            md.update(str.getBytes());
            byte[]byteDigest=md.digest();
            int i;
            StringBuffer buf=new StringBuffer("");
            for (int offset=0;offset<byteDigest.length;offset++){
                i=byteDigest[offset];
                if (i<0)
                    i+=256;
                 if (i<16)
                     buf.append("0");
                 buf.append(Integer.toHexString(i));
            }
            //32位加密
            return buf.toString();
            //16位加密
//            return buf.toString().substring(8,24);
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) {
        System.out.println(code("123456"));
    }
}
